Two-way bit



Jan. 28, 1958 e. GODFREY 2,821,364

TWO-WAY BIT Filed July 1, 1954 I I 6/64 /V7 GOD/CAPE y Q ATTORNEYGUnited States Patent ice TWO-WAY BIT Grant Godfrey, Satford, Ariz.

Application July 1, 1954, Serial No. 440,589

1 Claim. (Cl. 255-64) This invention relates to drill bits utilized indrilling holes in ore, coal and also utilized in drilling for oil, waterand for exploratory examinations.

One important object of the invention is to provide a novel device ofthis character in which provision is made for the easy withdrawal of abit in case it is necessary to perform this operation.

A second important object of the invention is to provide an integraldevice of this character which may be attached to the end of a drill rodand act both to drill inwardly or downwardly and to drill upwardly andoutwardly.

A third important object of the invention is to provide a device of thischaracter wherein the outward or upward movement of the bit may befacilitated by means provided on the upper side of the bit for clearingthe path of with drawal.

With the above and other objects in View, the invention consists ingeneral of certain novel details of construction and combination ofparts hereinafter fully described and illustrated in the accompanyingdrawings and particularly claimed.

In the accompanying drawings, like characters of reference indicate likeparts in the several views and:

Figure l is a perspective view of the improved invention applied to thelower end of a drill rod.

Figure 2 is an enlarged perspective view of the present inventionremoved from the drill rod.

Figure 3 is a transverse section on the line 3-3 of Figure 4.

Figure 4 is a section on the line 4-4 of Figure 3.

In the embodiment of the invention as herein shown there is provided agenerally cylindrical structure having a cylindrical body portion 10.This body portion has a vertical passage 11 extending therethrough andat the upper end of this passage internal screw threads 12 are formed iatented Jan. 28, 1958 so that the device may be attached to the lowerend of the drill rod 13 by means of this threading.

Projecting outwardly from the lower end of the body 10 but integraltherewith are lugs 14 and each of these lugs is slotted as at 15 toreceive and frictionally retain a cutter 16 which, for some purposes maybe of tool steel. In oil well drilling diamond cutters inset in steelshanks in conventional manner, may be employed.

At the upper end of the body there are provided similarly diverging lugs17 having cutting edges 18.

Now by reference to Figure 4 it will be seen that the diameter X of thecircle within which the cutters 16 revolve is somewhat less than thediameter of the circle in which the cutting edges 18 revolve.

In operation as the drill proceeds inwardly or downwardly a [cylindricalbore of relatively great diameter is formed. However, the drill holemade in this manner may fill in slightly behind the full diameterintended to be drilled. In such a case when it is desired to withdrawthe bit then the cutters 16 will have no power to remove any slightobstructions from the wall of the drill hole above the bit. The purposeof the cutting edges 18 is therefore to remove any of these slightobstructions and these cutting edges 18 may be made of the same materialas the body 10 since the work they do is very slight but they will clearthe way for ready withdrawal of the bit when desired. It has been foundthat as small a difierence in diameter as one-twentieth of an inch issuflicient to ensure easy withdrawal of the bit when such becomesnecessary or desirable.

What is claimed is:

As a new article of manufacture, a drill bit adapted to fit on the endof a drill rod and having a cylindrical socketed body portion, lugsspaced around and radiating outwardly from the lower end of said body,each of said lugs having a slotted cutter socket formed in its bottomface, said slots extending into said body, a cutter bit mounted in eachof said slots, divergingly and upwardly extending lugs spaced around theupper end of said body and having cutting teeth formed on their upperedges of lesser diameter in revolution than the cutters carried by thefirst-mentioned lugs, said upwardly extending lugs being integral withsaid body.

References Cited in the file of this patent UNITED STATES PATENTS 54,226Smith Apr. 24, 1866 658,060 Dudley Sept. 18, 1900 2,519,861 Turner Aug.22, 1950 2,628,072 Baker Feb. 10, 1953

